so if you think the reason is because all the young men became losers that sounds like some female supremacy ideology.

I would the same thing to a woman. You're making it into a men vs women thing. The number of young people which aren't in a relationship isn't only because men are alone. The number also went up for women.

And that chart doesn't account for demographics, white canadians have half the birth rate of muslims.

It's not half. It's 2.4 vs 1.5. And if you read even the article linked by OP you will see that Muslims which are born in Canada have more or less the same birth rate than a White Canadian woman. Only first generation immigrants have significantly higher birth rates.

So ur comparing the 70s when we were 95% white to today when 1/5th of the country is foreign born.

And in the 1970s where Canada was 95% white the fertility rate was at 1.7 for White women. Today it's at 1.5. What a collapse.

and the fertility rate is still doing down

And it's for all races, not only white people. And why the fuck should I give a shit about the fertility rate in the US?

So why did the fertility rate of usa drop from 2.1 to 1.7 in the span of 10 years? Did they all just get the pill in 2007?

Oh, what happened in 2007? Maybe there was a big recession which squashed millions of dreams ...